bootcamp and windows 7 upgrade

macrumors 6502

I have a 2010 macbook air 13...i want to put windows 7 on it via bootcamp and an external drive. The problem is that I have always used a win xp disc and then used my win 7 upgrade disc. But now, xp is no longer supported on macbook air....any suggestions as to how to get my upgrade disc to work?

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